Manziel was quick to respond.
Miller and Manziel both played at Texas A&M.
Manziel is the subject of a Dallas police investigation into a complaint filed by Colleen Crowley that he assaulted her the evening of Jan. 29.
Last week a judge granted Crowley's request for a protection order, ruling Manziel cannot see Crowley for two years and that he must stay 500 feet from her home and workplace.
Manziel told TMZ the assault "did not happen."